Evacuable valve, evacuable bag, and production process thereof

ABSTRACT

The present invention provides an evacuable valve which does not need a separate member such as a covering for closing an air-through portion and has a small portion that projects therefrom. A valve body  5  in the evacuable valve can securely contact the valve body contacting portion  32   a  and close an air-through portion  33  where the valve body  5  covers, thereby keeping the evacuated state for a long period of time. A valve seat portion  32  of the back face of an evacuable valve can at least partly rest in the depressed area  7  of the front face of the other valve, thereby being able to pile up the evacuable valves  1 . In the production process of evacuable bags that are provided with the evacuable valve, piling and storage of the evacuable valves do not need excessive space and much effort.

TECHNICAL FIELD

The present invention relates to an evacuable valve which may open andclose an air-through portion by a specific arrangement of a valve body,and an evacuable bag provided with the evacuable valve.

BACKGROUND OF THE INVENTION

As disclosed by Laid-Open Japan Utility Model Application H05-44837,there have been evacuable bags which may make goods such as clothing,bedding, etc. that are usually fluffy with air in small volume byremoving the air inside the bag.

An opening portion for inserting the goods formed on the disclosedevacuable bag may be hermetically closed. In addition, many kinds of anevacuable bag have an evacuable valve disposed with an air-throughportion for letting the air inside the bag out.

A vacuum can be connected with the evacuable valve of the bag whensucking the air in the bag out.

One of the evacuable valves used in the bag for containing bedding etc.is adduced by the above-mentioned Japanese application. This type of thevalve is formed integral with the evacuable bag, comprising a base bodyallowing communication between the inside and outside of the bag throughan air-through portion, and a covering which fits on the base body byscrewing together.

The base body is formed with a valve body, which may open and close theair-through portion formed on the covering when the covering is screwedoff the base body.

Specifically, the evacuable valve is arranged such that the valve bodyis left biased by energizing means such as a spring to close theair-through portion, and as aforementioned, only when the vacuum isconnected with the bag, the air-through portion is opened to let theinternal air out of the bag.

And finally, by screwing the covering onto the base body, the valve bodyis kept closed to ensure that the evacuable bag will maintain theevacuated state.

For the purpose of preventing any leak of air within the evacuable bag,the conventional evacuable valve needs a separate member such as acovering for closing the air-through portion. And, since the base bodyand the covering projecting from the evacuable bag, it may cause troublein piling the evacuable bags. Furthermore, in the production process, itmay become a problem to store the evacuable valves alone.

In view of the above-described problems, the present invention providesan evacuable valve that needs no separate member such as a covering forclosing an air-through portion and has only a small portion thatprojects therefrom.

The present invention also provides an evacuable valve which does notbulk and easily store in the production process of the evacuable bag.

SUMMARY OF THE INVENTION

To overcome said problems, a first aspect of the present inventionprovides an evacuable valve comprising a body member 2 provided with anair-through portion 33 passing from its front face to its back face, anda valve body 5 disposed so as to open and close the air-through portion33. The body member 2 includes a valve seat portion 32 for mounting thevalve body 5. The valve seat portion 32 has a valve body contacting area32 a which slants toward the front face as running from the central partthereof to the periphery. The air-through portion 33 is arranged toradiate in the valve seat portion 32 with a view from above. The valvebody 5 is securely fixed to the central part 32 b of the valve seatportion 32 and is movable close to or away from the valve bodycontacting area 32 a by floating out except for the fixed portion. Whilethe valve body 5 contacts the valve body contacting area 32 a, theair-through portion 33 is closed.

In a second aspect of the present invention, the evacuable valve of thefirst embodiment includes a depressed area 7 on the front face thereof.The valve seat portion 32 of one evacuable valve 1 can at lease partlyrest in the depressed area 7 of the other valve 1. The evacuable valvescan be piled up by putting the front face of one evacuable valve 1 andthe back face of the other evacuable valve 1 together.

In a third aspect of the present invention, an evacuable bag made offlexible resin film is provided with the evacuable valve 1 of the firstor second embodiments. The evacualble valve 1 is mounted in order forthe bag to communicate between the outside and inside of the bag throughthe air-through portion 33 formed on the valve seat portion 32 of theevacuable valves 1. Thus, the bag may be evacuated and keep theevacuated state.

A fourth aspect of the present invention provides a production processof the evacuable bag. The process comprises steps of opening a valvemounting hole 83 in the flexible resin film 81; taking one from thepiled evacuable valves 1 in accordance with any one of the first andsecond embodiments; positioning the evacuable valve 1 to coincide withthe valve mounting hole 83; and bonding the evacuable valve 1 to thefilm 81.

In the first aspect of the present invention, the valve body 5 cansecurely contact the slanted valve body contacting area 32 a, therebyenabling the air-through portion 33 to be securely closed to ensure theevacuated state. Furthermore, there is no need of providing a separatemember such as a covering for closing the air-through portion.

In the second aspect of the present invention, the valve seat portion 32of one evacuable valve can at least partly rest in the depressed area 7of the other evacuable valve, thereby being able to pile up theevacuable valves. Besides, piling and storage of the evacuable valves 1do not need excessive space and much effort even in the productionprocess of the evacuable bags 8.

In the third aspect of the present invention, the evacuable bag 8 whichmay keep the evacuated state thereinside for a long period of timewithout provision of a separate member such as a covering for closingthe air-through portion is provided.

In the fourth aspect of the present invention, a production process ofthe evacuable bags 8 that can keep the evacuated state for a long periodof time is provided.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from thedetailed description given hereinbelow and the accompanying drawings,which are given by way of illustration only, and thus are not limitativeof the present invention, and wherein:

FIG. 1(A) is a plan view illustrating an evacuable valve of theembodiment of the present invention, and FIG. 2(B) is a bottom viewillustrating the same,

FIG. 2 is a cross sectional view taken along a line I-I,

FIG. 3(A) is a cross sectional diagram showing the structures of thesections of the evacuable valve of the embodiment of the presentinvention, and FIG. 3(B) is a plan view of the valve body,

FIG. 4 is a plan view showing an evacuable bag equipped with theevacuable valve of the embodiment,

FIG. 5 is a cross sectional diagram showing the piled evacuable bags,

FIG. 6(A) is a diagram showing the ridges of the evacuable valvefunctioning as spacer, and FIG. 6(B) is a diagram showing a direction inwhich air is flowing, and

FIG. 7 is a diagram showing an example of the production system forevacuable bags of the embodiment, and FIG. 7(B) is a diagram showing therelationship between the bag sheet and the evacuable bag duringproduction.

DETAILED DESCRIPTION OF THE INVENTION

In the following description, as regards a body member 2, the side (asshown in FIG. 1(A)) where a valve body 5 is provided shall be referredas “front face”, while the other side thereof (in FIG. 1(B)) as “backface”, and any reference to the directions of the front and back will bemade based on the above-described sides.

In this embodiment, an evacuable valve 1, which is made of syntheticresin, is composed of a body member 2, a valve body 5 and a valve bodycovering 6.

The body member 2 is a plate-like member in appearance, wherein air isallowed to pass through air-through portion 33 between the front andback faces.

This particular body member 2 comprises a valve portion 3 formed with anair-through portion 33 and a base portion 4 formed around the valveportion 3 for the purpose of attachment to the evacuable bag 8.

In this embodiment, the valve portion 3 includes a wall 31 and a valveseat portion 32 positioned in a direction of the back face of the wall31.

The wall 31 looks like a ring in a plan view and a wall in a crosssectional view, as shown in FIG. 2, projecting from the base portion 4in both directions of the front and back faces.

Though the wall 31 is shown to be perpendicular to the base portion 4here, it does not limit to this and may be formed at an angle to saidbase portion 4.

On the inner surface of the wall 31 is provided with fitting projection32 e for fitting and securing the valve body covering 6 (see FIG. 3(A)).

The valve seat portion 32, being made planar, shares a back face end 31b of the wall 31 and resembles a bowl with the bottom constituting acenter portion 32 b, as viewed from the front face. In this embodiment,the center portion 32 b is flat, while a valve body contacting area 32 aencompassing the center portion has a tapering slanted surface. Thevalve seat portion 32 may be entirely consisted of curved surface like adish antenna.

The valve body contacting area 32 a is a portion formed on said taperingslanted surface on the front face of the valve seat portion 32. By wayof contact of the film valve body 5 to the valve body contacting area 32a, the air-through portion 33 formed in a position where the valve body5 covers in a plan view may be closed.

In this embodiment, a valve body fixing projection 32 c is provided inthe center portion 32 b, projecting therefrom. As shown in FIG. 3(B),the valve body 5 may be mounted on the valve seat portion 32 by fittingthe projection into a mounting hole 51 a formed in the valve body 5.

With the evacuable valve 1 of this embodiment, as shown in FIG. 5, theevacuable valves can be piled up by putting the back face end 31 b (aperipheral portion of the valve seat portion) of an evacuable valve 1 onthe front face end 31 a of the wall 31 in the piled evacuable valve 1.

As discussed later, in consequence that a valve body 5 and a valve bodycovering 6 are mounted on the valve portion 3, a depressed area 7includes said wall 31 and the valve body covering 6. Part of the valveseat portion 32 and valve portion ridges 32 d formed on the back face ofthe valve seat portion 32 will rest in the depressed area 7. Thisenables the evacuable valves 1 to pile up neatly, and in the productionprocess of evacuable bags, as illustrated by FIG. 7(A), the productionsystem 100 can subsequently operate in a relatively compact space thanksto the piled valves.

The air-through portion 33 is formed in the valve seat portion 32 so asto communicate from the front face to the back face. As seen in FIG.1(B), the air-through portion 33 radiates from the center of the valveseat portion in a plan view. In this embodiment, the air-through portion33 where to be covered by the valve body 5 is divided in four directionsat right angles to the respective adjacent ones.

Reinforcing pieces 33 a, 33 b are provided at the air-through portion 33to extend in radial and circumferential directions respectively. Theair-through portion 33 is set off by the reinforcing pieces 33 a, 33 bso as to be spaced 90 degrees apart in four directions in a plan view.The reinforcing pieces 33 a, 33 b on the front face are flush with thevalve body contacting area 32 a, constituting the same surface. Such anarrangement of the reinforcing pieces 33 a, 33 b setting off the valvebody 5 prevents the valve body 5 from bending and being sucked into theair-through portion 33 under the influence of atmospheric pressure whenthe valve body 5 has closed the air-through portion 33, whereby airleakage through a clearance which may be formed between the valve body 5and the valve body contacting area 32 a will not occur, thus resultingin the air-through portion 33 being securely closed.

Of both reinforcing pieces 333 a, 33 b, the reinforcing pieces 33 a,which have been formed to extend in a radial direction, also may serveas a valve portion ridge 32 d, as described later.

The form of the air-through portion 33 in a plan view does not limit tothe abovementioned, but may employ various shapes such as a slit or around hole. And the reinforcing pieces are also made changeable, forexample, in the form of a mesh.

As aforementioned, forming the valve seat portion 32 aslope and theair-through portion 33 radial in a plan view enable air to flow smoothlyfrom the back face to the front face in the evacuable valve 1 throughthe air-through portion 33. That is, as shown in FIG. 4, if theevacuable valve 1 of the present embodiment is mounted on the evacuablebag 8, an air stream F along the base portion 4 inside the bag will flowtoward the air-through portion 33 by virtue of the slope on the backface of the valve seat portion 32 and valve portion ridges 32 d so thatquick evacuation can be achieved (see FIG. 6(B)).

As shown in FIGS. 3(A) and 3(B), the valve body 5 is a piece of film. Inaccordance with the present embodiment, slits 52, which are cut off fromthe outer periphery in the radial direction, divide a round of the valvebody in a plan view into four equal parts, thereby bearing four valveblades 53 to be formed around a central portion 51 in a cloverleafpattern, as viewed from above.

The central portion 51 in the valve body 5 fits to the valve seatportion 32, being provided with a cross-shaped mounting hole 51 a inthis embodiment. The valve seat portion 32 and the valve body 5 arejoined together by fitting the valve body fixing projection 32 c beingcrossed-shaped in a plan view and provided on the central portion 32 bof the valve seat portion 32 to the mounting hole 51 a. Thus, thecentral portion 51 of the valve body 5 has been securely fixed inposition, wherein the valve blades 53 may move close to or away from thevalve body contacting area 32 a by means of its floating motion.

The valve body 5 is in a flat form to be able to cover the air-throughportion 33 which is formed radial on the valve seat portion 32. Inaddition, the valve body 5 may contact the valve body contacting area 32a on the surface of the valve seat portion 32. The abovementionedarrangement makes it possible to allow the valve body 5 to close theair-through portion 33.

To cope with what has been described above, the valve body 5 will bemade to match the air-through portion 33 in shape. Therefore, accordingto the shape of the air-through portion 33, the number of the valveblades 53 may be determined, e.g. two, three, or more than five.Moreover, each of the valve blades 53 may be respectively madeindependent rather than share the central portion 51.

Also, with reference to the attachment of the valve body 5 to the valveseat portion 32, adhesives, thermal bonding, screws or rivets may beemployed in addition to fitting of the valve body mounting hole 51 a andthe valve body fixing projection 32 c of the valve seat portion 32. Asregards the position where to fix the valve body 5, outer peripheries,side ends, or other areas than the central portion 51 of the valve body5 may be available to match the shape of the valve body 5.

As foregoing, the valve body 5 is a film type, and it is preferable thatit be flexible in nature and excellent in resiliency of the form. To bemore specific, relatively flexible resin film or paper impregnated withresin may be used. The back face of the valve body 5, where the valvebody contacting area 32 a contacts, may be coated with adherentmaterials to improve adhesion to the valve body contacting area 32 a inclosing the air-through portion 33.

Owing to the valve body 5 as disclosed above, the air-through portion 33in evacuation is opened only by the air flowing from the back face tothe front face, and except for that, the valve body 5 sticks to thevalve body contacting area 32 a so as to keep the air-through portion 33closed. This may avoid unexpected opening of the air-through portion 33except for evacuation, even if no separate covering of screw fitting inthe prior art is provided, and the evacuable bag 8 provided with theevacuable valve 1 may hold its airtightness for a long period of time.

For the purpose of reassuring users of the bag, as shown in FIG. 3(A), acap 9 fit to the wall 31 of the body member 2 may be provided by way ofcovering of the valve portion 3 in the evacuable valve 1 of thisembodiment is.

As above mentioned, the valve body covering 6 together with the valvebody 5 is mounted to the valve body fixing projection 32 c formed on thevalve seat portion 32. Shown in FIGS. 1(A) and 3(A), the valve bodycovering 6 shapes like a disk in a plan view and has a round air hole 61formed in the center thereof. Provided in the back face of the valvebody covering 6 is a valve body press foot 62 in a manner of headingfrom four directions to the center. As shown in FIG. 3(A), said valvebody press foot 62 is triangular in a cross sectional shape while theshape in the back face is linear to match the slope of the valve bodycontacting area 32 a.

Such being the case, when the valve body covering 6 is attached to thevalve portion 3, a predetermined clearance will be constituted betweenthe valve body contacting area 32 a and the valve body press foot 62. Asshown in FIG. 2, the valve body 5 is to be disposed in this clearance.

When the valve body covering 6 is attached to the valve portion 3, thevalve body press foot 62 embraces the central area of valve blades 53 ofthe valve body 5, being disposed from the central portion 51 tocircumferential directions. In this case where the valve blades 53 areformed to extend in four different directions, the valve body pressfoots 62 are formed to extend in the four directions responding to theblades. Thus, the valve body press foot 62 will be formed to cope withthe shape of the valve body 5 when the valve body 5 is different fromthe shape in the present embodiment.

The positions of the clearance and the valve body 5 are determined toprevent excessive floating of the valve body 5, as is explained later.

So, even if there still exists a clearance between the valve bodycontacting area 32 a and the valve body press foot 62, where the valvebody 5 disposed in the position can float, it is acceptable. Or thevalve body 5 may be tightly sandwiched between the valve body contactingarea 32 a and the valve body press foot 62, meaning no clearance existstherebetween.

Referring to the abovementioned respect, it is most preferable that asin the latter case, the valve body 5 bear a contact relationship betweenthe valve body contacting area 32 a and the valve body press foot 62.

Here, the larger the air-through portion 33, the more smoothlyevacuation is achieved, but that would entail enlargement of the valvebody 5 and the valve blades 53 of the valve body 5 will be liable tofloat, thereby increasing the risk of air leakage.

Thus, the relationship between the valve body contacting area 32 a andthe valve body press foot 62 sandwiching the valve body 5 therebetweenmay let the valve body press foot 62 function to separate the valveblades 53, thereby ensuring reduction of the risk of air leakage due tofloating of the valve body 5.

In the center of the air hole 61 of the valve body covering 6 isprovided a cylindrical mounting portion 63, which is fully supported bythe valve body press foots 62 and fits to the valve body fixingprojection 32 c as formed in the valve seat portion 32. By this means,the central portion 51 of the valve body 5 will be sandwiched betweenthe central portion 32 b of the valve seat portion 32 and said mountingportion 63 before the valve body 5 stays fixed.

The outer periphery of the valve body covering 6 fits to fittingprojection 32 e formed on the inner surface of the wall 31 (see FIG.3(A)). The valve body covering 6 may be firmly stuck on the valve bodyportion 3 accordingly.

Owing to the valve body covering 6 thus mounted to the valve portion 3,even when air passes through the air-through portion 33, the valve body5, floating of which is limited by the valve body press foot 62, willnot flip over and may securely close the air-through portion 33.

The base portion 4 is a flat portion as formed around the valve portion3 and substantially rectangular in a plan view, as shown by FIGS. 1(A)and 1(B).

The front face of the base portion 4 consists of a flat smooth surface,where a bag film 81 is attached by any bonding means such as thermalbonding. On the back face thereof is formed with base portion ridges 41.In this embodiment shown in FIG. 1(B), they are arranged parallel at apredetermined interval to the longer side of the base portion 4.

When an evacuable bag 8 has been completed as shown in FIG. 4, the baseportion ridges 41 serve as a spacer for bearing a clearance between thebeg film 81 of the evacuable valve 1 side and the film 81 of the otherside (see FIG. 6(A)), and also function to guide the internal air towardthe air-through portion 33 of the evacuable valve 1 (see FIG. 6(B)),thereby ensuring discharge of the internal air of the evacuable bag 8.

If said function of the base portion ridges 41 matters, it is preferablethat the base portion 4 be provided as in the case of the presentembodiment, but if not, an evacuable valve 1 consisting only of a valveportion 3 may be directly mounted to the evacuable bag 8 withoutprovision of a base portion 4.

Referring to the shape of the base portion 4, it is not limitedrectangular, and a variety of shapes such as circular or oval one may beavailable.

As well as the back face of the base portion 4 where the base portionridges 41 are formed parallel to the long side thereof, the valveportion 3 is also provided with radial valve portion ridges 32 d on theback face of the valve seat portion 32, as shown in FIG. 1(B).

FIG. 6(B) shows that the air inside the evacuable bag 8 provided with anevacuable valve 1 is guided to the valve seat portion 32 by the baseportion ridges 41, and consequently to the air-through portion 33 by thevalve portion ridges 32 d. Thus, the air inside the evacuable bag 8 iseasily guided to the air-through portion 33.

FIG. 6(A) shows that the ridges 41, 32 d function as a spacer so thatthe constituent clearance between the bag film 81 of the valve 1 sideand the bag film 81 of the other side can be maintained without theircontacting. This arrangement may avoid any interruption caused by tightcontact of the bag films in emission of the air, resulting in completeevacuation.

The evacuable valve 1 of the present embodiment having the structure asmentioned above is mounted on the evacuable bag 8 for actual use, asshown in FIG. 4.

A bag to be used as evacuable bag 8 is made of a bag film 81 of flexibleresin and the like, having a closing means 82 a such as a zipper,provided at the opening portion 82 in order to keep the bag airtight.The production method for the evacuable bag 8 is described later.

General use of this particular evacuable bag 8 is as follows. First, ahose or nozzle of the vacuum is connected to the valve body covering 6of the evacuable valve 1. Then, the vacuum turns on so as to detach thevalve body 5 from the valve body contacting area 32 a, whereby theair-through portion 33 and the air hole 61 of the valve body covering 6are opened to emit the air inside the bag through said elements. Afterthe emission of the air is finished and the hose or nozzle the vacuum isdisconnected from the evacuable valve 1, the valve body 5 contact thevalve body contacting area 32 a again, resulting in closing theair-through portion 33. In this occasion, since the valve body 5strongly sticks to the valve body contacting area 32 a under atmosphericpressure, unexpected opening of the air-through portion 33 will notoccur, which ensures that the evacuated condition inside the bag will bemaintained for a long period of time.

Now, the description will be made of a production process of theevacuable bag 8 of this embodiment.

Flexible resin film of polyethylene or the like is used as a materialfor the bag. In this embodiment, a sheet of bag film 81 wound in a rollis fed in a longitudinal direction thereof to be processed.

As shown in FIG. 7(B), a mounting hole 83, where an evacuable valve 1 isto be mounted, is formed in the bag film 81. The hole is slightly biggerthan the valve portion 3, more specifically, than the outer diameter ofthe wall 31 in a plan view.

A production system 100, shown in FIG. 7(A), for performing saidproduction process includes a server 102, where evacuable valves 1 pileup in the fashion shown in FIG. 5 next to the film 81. Each valve hereis ready-assembled with a body member 2, a valve body 5, and a valvecovering 6. A lowest one of the piled valves 1 is taken out to slidetoward the direction of lying over the bag film 81 in order for thevalve portion 3 of the evacuable valve 1 to coincide with said mountinghole 83 of the bag film. In this case, though not shown, an actuatortraveling along a slide track 101 which is discussed later moves theevacuable valve 1. Then, the film 81 and the base portion 4 of the valve1 are securely fixed by thermal bonding.

After that, the film 81 provided with the evacuable valve 1 and the film81 of the opposite side are bonded to make a bag. Concurrently, afastener 82 a for closing the opening portion 82 is provided to completean evacuable bag 8.

The above-described steps are as one example, so they may be changed insequence or be increased by an additional step.

As discussed already, the base portion ridges 41 are formed on the backface of the base portion 4 of the evacuable valve 1 in a direction ofthe longer side. Concerning the production system 100 of thisembodiment, a linear slide track 101 is provided at right angle to thedirection of the longer side of the film 81. Not shown in detail, thisslide track 101 consists of more than a couple of parallel rails 101 awhich are laid hanging in midair or fixed onto a flat plate. The rails101 a maintain an interval therebetween to correspond with the intervalsbetween the base portion ridges 41 when an evacuable valve 1 is placedon the slide track 101. As a slide track 101 in this embodiment, tworails 101 a, 101 a are disposed and have an interval to correspond withthe interval L between the outmost ridges 42 of the base portion 4 asshown in FIG. 1(B).

The evacuable valve 1 placed on the rails 101 a of the slide track 101may slide on the slide track 101. Thus, the base portion ridges 41function as a guide for the valve in sliding on the track so that theproduction process can be carried out efficiently.

In the first aspect of the present invention, a valve body can securelycontact a slanted valve body contacting area, thereby enabling anair-through portion to be securely closed to ensure the evacuated state.Furthermore, there is no need of providing a separate member such as acovering for closing the air-through portion.

In the second aspect of the present invention, the valve seat portion ofone evacuable valve can at least partly rest in the depressed area ofthe other evacuable valve, thereby being able to pile up the evacuablevalves. Besides, piling and storage of the evacuable valves do not needexcessive space and much effort even in the production process ofevacuable bags.

In the third aspect of the present invention, the evacuable bag may keepthe evacuated state thereinside for a long period of time withoutprovision of a separate member such as a covering for closing theair-through portion.

In the fourth aspect of the present invention, a production process ofthe evacuable bag that may keep the evacuated state for a long period oftime is provided.

1. An evacuable valve comprising a body member provided with anair-through portion passing from its front face to its back face, and afilmy valve body disposed so as to open and close the air-throughportion, wherein the body member includes a valve seat portion formounting the valve body, said valve seat portion having a valve bodycontacting area which slants toward the front face as running from thecentral part thereof to the periphery, and the air-through portion isarranged to radiate in the valve seat portion with a view from above,and the valve body is securely fixed to the central part of the valveseat portion and is movable close to or away from the valve bodycontacting face by floating except for the fixed portion, and closes theair-through portion while contacting the valve body contacting area. 2.The evacuable valve of claim 1, wherein it includes a depressed area onthe front face thereof, whereby one evacuable valve can at least partlyrest in the depressed area of the other valve, and accordingly theevacuable valves can be piled up by putting the front face of oneevacuable valve and the back face of the other evacuable valve together.3. An evacuable bag made of flexible resin film and of internal sealablestructure, wherein the evacuable valve of claim 1 is mounted tocommunicate between the outside and inside of the bag through theair-through portion formed on a valve seat portion of the evacuablevalves, whereby the bag may be evacuated and keep the evacuated state.4. A production process of the evacuable bag comprising steps of:opening a valve mounting hole in the flexible resin film; taking onefrom the piled evacuable valves of claim 1; positioning the evacuablevalve to coincide with the valve mounting hole; and bonding theevacuable valves to the film.
 5. An evacuable bag made of flexible resinfilm and of internal sealable structure, wherein the evacuable valve ofclaim 2 is mounted to communicate between the outside and inside of thebag through the air-through portion formed on a valve seat portion ofthe evacuable valves, whereby the bag may be evacuated and keep theevacuated state.
 6. A production process of the evacuable bag comprisingsteps of: opening a valve mounting hole in the flexible resin film;taking one from the piled evacuable valves of claim 2; positioning theevacuable valve to coincide with the valve mounting hole; and bondingthe evacuable valves to the film.